If you really wanted to make things easier, you would reduce / eliminate all the various deductions & credits and lower the rates to keep total tax revenue to the same. (freefrombroke.com)
The appropriate metric is not the distribution of total tax revenues, but the percentage of income paid. (nystateofpolitics.com)
As of 2014, in terms of total tax revenue as a percentage of GDP and measured per capita, Norway came in at No. 2 out of 35 countries ($ 37,682 USD), Denmark at No. 3 ($ 30,630 USD), and Iceland came in at No. 9 ($ 20,418 USD), according to the OECD. (cnbc.com)